body {
  font-family: sans-serif;
  font-weight: 400;
  line-height: 1.7;
  color: $color-gray-dark;
  padding: 3rem;
}

.heading-primary {
  color: $color-white;
  text-transform: uppercase;
  margin-bottom: 6rem;
  // 反转时背面隐藏
  backface-visibility: hidden;

  &-main {
    display: block;
    font-size: 6rem;
    font-weight: 400;
    letter-spacing: 3.5rem;
    // 动画必须三要素
    animation-name: moveInLeft;
    animation-duration: 1s;
    animation-timing-function: ease-in;
  }

  &-sub {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 1.7rem;
    animation: moveInRight 1s ease-in;
  }
}

.heading-secondary {
  font-weight: 700;
  font-size: 3.5rem;
  color: transparent;
  text-transform: uppercase;
  background-image: linear-gradient(to right, $color-primary-light, $color-primary-dark);
  display: inline-block;
  -webkit-background-clip: text;
  letter-spacing: .2rem;
  transition: all .2s;

  &:hover {
    transform: skewY(2deg) skewX(15deg) scale(1.1);
    text-shadow: .5rem 1rem 2rem rgba($color: #000000, $alpha: 0.2);
  }
}

.heading-tertiary {
  font-size: $default-font-size;
  font-weight: 700;
  text-transform: uppercase;
}

.paragraph {
  font-size: $default-font-size;

  &:not(:last-child) {
    margin-bottom: 4rem;
  }
}